Figure 6.19. Spectral reflectance of sea water observed
from an aircraft flying at 305 m over waters of different colors in
the Northwest Atlantic. The numerical values are the average chlorophyll
concentration
in
the euphotic (sunlit) zone in units of mg/m3. The reflectance
is for vertically polarized light observed at Brewster's angle of
53°. This angle minimizes reflected skylight
and emphasizes the light from below the sea surface. From Clarke,
Ewing, and Lorenzen (1970).